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September 13th, 2020

Neck-Turning Brass with Milling Machine — High-Speed Solution

cartridge brass neck turn neck-turning milling machine Erik Cortina

Here’s the super-speedy way to turn case-necks. Our friend Erik Cortina figured out how to turn his match cartridge case-necks using his milling machine. Erik told us: “While in Raton [a while back], Mid Tompkins told me that he turns his brass on milling machine. He said he could do about 500 in two hours, so I decided to try it.”

Erik fitted a Don Nielson “Pumpkin” neck-turner to the mill, and he used a modified 21st Century case holder to secure the brass. As you can see from this video, Erik was very successful with the process. The tool spins at 1500 rpm, turning Lapua 6.5-284 cases that have been necked up to 7mm.

Video Shows Eric Cortina Neck-Turning Cases with Milling Machine:

Cartridge Brass: Lapua 6.5-284 necked up to 7mm
Lubricant: Lithium grease inside and outside of neck
Neck-Turner: Nielson Pumpkin running at 1500 RPM

It’s hard to argue with Erik’s results. Here are his turned Lapua cases, which have neck-wall thickness consistent to two ten-thousandths of an inch. Think you could do better turning manually?

cartridge brass neck turn neck-turning milling machine Erik Cortina

Some of Erik’s Facebook friends had questions about this process:

Q: Who makes the shell-holder?

Erik Cortina: I did! The shell-holder you can get from 21st Century. I Tig-welded a punch as a handle.

Q: I love the idea of working smarter not harder! Any galling issues? What are your mitigation techniques?

Erik Cortina: No issues. I use lithium grease in spray can. Makes a foam that I dip necks into.

Q: Shouldn’t either the case or the cutter be floating to allow most precise neck turning?

Erik Cortina: Up until [I tried this] I believed the same thing. I was going to build a floating case holder but decided to try rigid setup on a few cases before I built it. Results were great. Neck thickness doesn’t vary more than .0002″, which is same as when I was doing it with floating case holder on the lathe.

Q: Any problems with the Pumpkin changing the cut as it heats up?

Erik Cortina: No — there were no issues with that.

NOTE: Erik Cortina is a very skilled machinist who custom-crafted fittings used for this process. This kind of neck-turning with a milling machine may not be for the everyday hand-loader!

cartridge brass neck turn neck-turning milling machine Erik Cortina

Nielson “Pumpkin” Neck-Turner

The circular orange cutting fixture on Erik’s Milling Machine is a Don Nielson “Pumpkin” neck-turning tool. Don designed this tool to be used by hand or with power. The Pumpkin boasts an eccentric mandrel that allows the cut to be adjusted easily in precise .0001″ increments. Benchresters like this as it allows for very precise control of cut depth and neck-wall thickness.

cartridge brass neck turn neck-turning milling machine Erik Cortina
Nielson Neck Turner with carbide mandrel. Photo Courtesy Butch’s Reloading.

Permalink - Videos, Bullets, Brass, Ammo, Gunsmithing, Reloading, Tech Tip No Comments »
September 16th, 2017

IBS Match Report: Visalia 3-Gun California Championship

IBS International Benchrest Shooters Visalia CA california match Boyd Allen
The Visalia Sportsman’s Association Dale Wimp Shooting Range — a great place to shoot.

Report by Boyd Allen | Photos and video by Pete Kitrinos
The IBS is in the West! The first International Benchrest Shooters (IBS) match at the Visalia, CA range was held over the recent Labor Day Weekend. Despite scorching 106° heat, many of the West’s top short-range benchrest shooters assembled for the first IBS-sanctioned match (after a 30-year history with the NBRSA) at the Visalia range. The mix of shooters included at least one Benchrest Hall of Fame member, as well as NBRSA record holders. Competitors were happy to return to Visalia, which had been closed for seven months while range improvements were made (some parts of the East berm were still under construction). With only two ranges in the entire state holding short range group matches, the temporary loss of Visalia had a significant impact. It was time to get back to business — the business of shooting tiny groups.

This video includes Aerial Drone footage of the range — worth watching!

Surrounded by fields, the Visalia Range is located in California’s Central Valley, a rich agricultural area.
IBS International Benchrest Shooters Visalia CA california match Boyd Allen

For about thirty years the California 3-Gun Benchrest Championship match has been held at the Visalia Sportsman’s Association Dale Wimp Range over Labor Day weekend. For all those years, the matches have been put on by local shooter and current club president Dennis Thornbury. During a good part of that time, he has also managed to keep his name in the NBRSA record book, and pick up four Benchrest Hall of Fame points, as well as having recently done a tour as NBRSA president. This year’s match is sanctioned by the IBS, a first at Visalia.

Don “The Pumpkin” Nielson used an action he fabricated, a “fat bolt” aluminum 3-lug with steel insert.
Visalia IBS Benchrest Rest

Dennis Thornbury has been putting on registered matches at the Visalia range for 30 years. He holds an NBRSA record, and has 4 Hall of Fame points.
IBS International Benchrest Shooters Visalia CA california match Boyd Allen

The format: On Saturday competitors shot 100 yards all day, Sporter in the morning, Light Varmint in the afternoon. The following day the morning competition was Heavy Varmint at 100 and at lunch the targets were moved to 200 yards with Heavy Varmint being shot that afternoon. On Monday, Labor Day, at 200 yards, Light Varmint was shot in the morning and Sporter in the afternoon. All three days consisted of five, 5-shot matches in the morning and five more in the afternoon.

Morning, Day 1 — Very few “daisy wheels”. This has been the trend for many years at this range.
IBS International Benchrest Shooters Visalia CA california match Boyd Allen

Getting down to business. Shown, from right to left: Henry Pinkney, Joe Stanovich, Steve Epstein, Keith Cottrell (face obscured), Jim Nicolas (standing).
IBS International Benchrest Shooters Visalia CA california match Boyd Allen

Sunday Top Shots: Jack Childers, Keith Cottrell, John Pierce, Lester Bruno, Dennis Thornbury, and Don Nielson. (Yes that’s a corn field in the background):
Visalia IBS Benchrest Rest

With the big temp changes between morning and afternoon, competitors were chasing powder loads all weekend. Small groups were hard to find, so only three “screamers” were recorded all weekend, and no teen Aggs. With the oppressive heat, attrition was also a factor: “We started with 30 shooters, and ended with just 21 competitors”.

Temperatures were in the triple digits for Saturday and Sunday, backing off to the high 90s on Monday. High humidity made it feel even hotter — heat stress was a definite issue. Even the rifles seemed to be at less than their best, causing very light wind conditions to produce Aggregates that were larger than the observed wind conditions would lead one to expect. Wind was generally light and switchy. Lighter mornings with wind increasing slightly through the days. Sunday saw more wind than the other two days after ten o’clock or so.

Loading benches with the usual clutter. Note the LabRadar chronograph on a bench at the firing line. Lawrence Weisdorn tracked his velocities during the match to know when a powder charge adjustment was needed.
IBS International Benchrest Shooters Visalia CA california match Boyd Allen

Top Shooters: The Top Five in the 3-Gun (HV, LV, and Sporter) Championship were: Keith Cottrell (.2534), John Pierce (.2695), Dennis Thornbury (.2714), Art Kawai (.2885), and Rich Shaw (.3016). Winners of the Class Grand Aggs were Dennis Thornbury (HV .2424), Lester Bruno (LV .2400), and Keith Cottrell (Sporter .2395). CLICK HERE for full Match Results.

Visalia IBS Benchrest Rest

Equipment List for Top Five Shooters
Visalia IBS Benchrest Rest

You can use a LabRadar during competition. This was Lawrence Weisdorn’s set-up at Visalia.
IBS International Benchrest Shooters Visalia CA california match Boyd Allen

Benchrest Technique — How to Shoot at Visalia
This range is built a bit like a large bathtub, dug into a flat field with the excavated earth thrown up in steep berms on three sides. This configuration and the usual lack of strong winds creates a lot of thermal-generated switchiness with flags changing direction often and very little agreement within any shooter’s set. This places a high premium on visual memory and the ability to judge equivalent conditions, because duplicates are almost never seen. Although the opportunity to run groups can happen, this is mostly a “pickers” range, which places a high premium on visual memory.

Visalia IBS Benchrest Rest

Facilities at Visalia Sportsman’s Association Range
There are 28 monolithic, steel-reinforced, concrete benches (poured in place, base and top all one pour). The reloading area is behind the benches with most of it on the same level as the benches. There are permanent (fixed position) tables that have laminate tops, except for where the range house sits, mid-range, with a “wailing wall” along its east and north sides. The direction of fire is north. The benches are under a slightly pitched metal roof that has recently been extended so that it has a good amount of overhang in front of the benches. Electricity is available in the reloading area and there are a few electrical outlets in the parking lot for RVs. There are both steps and a wheelchair ramp connecting parking lot to the reloading level and the shooting level.

Visalia IBS Benchrest Rest

Field of (Benchrest) Dreams — Precision Shooting Among the California Corn Fields.
Visalia IBS Benchrest Rest

Permalink Competition, Gunsmithing, Shooting Skills 4 Comments »