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March 11th, 2011
Shooters who convert factory actions to run 6BRs, 6PPCs or other high-pressure cartridges should consider having the firing pin bushed. These modern cartridges like to run at high pressures. When running stout loads, you can get cratering caused by primer flow around the firing pin hole in the bolt face. The reason is a little complicated, but basically the larger the hole, the less hydraulic pressure is required to crater the primer. A limited amount of cratering is normally not a big issue, but you can reduce the problem significantly by having a smith fit a bushing in the firing pin hole. In addition to reduced cratering, bushing the firing pin often produces more consistent ignition.
This is a highly recommended procedure that our editors have had done to their own rifles. Greg Tannel (Gre-Tan Rifles) is an expert at this procedure, and his turnaround time is fast — usually 2-3 days (shop time). Current price for a bushing job, which includes turning the firing pin to .062″, is $82.00 including USPS Priority Mail return shipping.
If you have a factory rifle, a bushed firing pin is the way to go if you are shooting the high-pressure cartridges such as 6PPC, 6BR, 6-6.5×47 and 6.5×47. This is one of the most cost-effective and beneficial upgrades you can do to your factory rifle. For more info on the Firing Pin Bushing process, visit GreTanRifles.com, or email greg [at] gretanrifles.com. (After clicking the link for GreTanRifles.com, Click on “Services” > “Shop Services” > “Bolt Work”, and you’ll see a listing for “Bush Firing Pin Hole & Turn Pin”. Select “View Details”.)
 Firing Pin Hole Bushing by Greg Tannel
Work Done: Bush firing pin hole and turn pin.
Functions: Fixes your cratering and piercing problems.
Price: $75.00 + $7.00 return shipping
Total Price: $82.00
Actions for which Bushing is Offered: Remington, Winchester, Savage, Sako, Kimber, Cooper, Nesika, Stiller, Bat, Kelbly, Lawton, Surgeon, Borden, Wichita, Hall, CZ, Ruger, Mauser, Howa, Weatherby, Dakota, Pacific Tool, Phoenix, RPA Quadlite, and Defiant bolt action rifle or pistol. Note: There may be extra tooling charges for case-hardened style bolts (Mauser, CZ, and similar) .
Actions for which Bushing is NOT Available: ARs, Accuracy International, Desert Tactical Arms, Big Horn, Rim fires, Falling block, Break open, Lever, Pump rifles.
How to send your bolt in to be bushed:
You can send your bolt snail mail, priority mail, UPS, Fed-Ex. What ever you prefer. Please include your name, phone number, and return shipping address. Turn around is normally 1 to 3 days shop time (plus shipping time). We usually do them the day that we get them in. Total cost is $82.00 for one bolt or $157.00 for two (this includes return shipping, priority mail.) Three or more will be sent back to you UPS and we will have to calculate extra shipping. We can overnight them at your expense. Check, money order, or credit card is fine with us.
July 23rd, 2010
Robert Whitley sampled a recent lot of Lapua 6mmBR brass and found that the neck-walls are marginally thinner, resulting in a very slightly smaller loaded neck diameter. Here is Robert’s report….
For the last few years the different boxes of Lapua 6mmBR Norma brass I have purchased (four different lots) have yielded brass with necks that measured around .269″ – .2695″ loaded. While this worked out very well in a variety of applications, sometimes I had to neck-turn that brass because it was a little too tight for an application or chamber I had. I recently received some of the latest “blue box” Lapua 6mm BR Norma brass (Lot # P00487801) and this latest lot of 6BR brass measures right around .268″ loaded (with popular 6mm bullet types). While some may bemoan the smaller neck diameter of this latest brass lot, for others, this can be a buying an opportunity to resolve an existing clearance issue with a “no neck turn” chamber. For example, if you have a .271″ “no neck-turn” type chamber, this may help resolve clearance issues that arose with other batches of brass. Or, for those who need to turn their necks to fit a tighter chamber, this new lot of 6mmBR brass has about .001″ – .0015″ less metal to remove, making the turning process that much easier.
 This lot of brass (Lot # P00487801) was obtained from Graf & Sons. Since the batches of Lapua 6mmBR Norma brass that come into this country typically sell out quickly, if this .268″-loaded-neck brass is of interest to you, get some soon as it may go fast. While in years past I tried to keep my neck clearance very close to the chamber neck diameter, as time passes, I am now finding that in some situations a little more neck clearance can help remedy an accuracy or consistency issue. A certain amount of clearance is clearly needed for the proper accuracy and consistency of ammunition, but in some situations a tight neck clearance is not optimum and may be more detrimental then beneficial. We tinker with everything else with our loads and rifles, why not neck clearance? — Robert Whitley
Editor’s NOTE: If you need some new 6BR brass, but your existing cases have no-turn necks which are .269″+ loaded, you may want to segregate the newer .268-necked brass. Segregating the new brass will allow you to use a a slightly smaller diameter bushing to maintain the same amount of grip on the bullet (as before). Other than this minor change in neck diameter with this lot of brass, this Lapua 6mm BR Norma brass is essentially the identical product as it has been all along.
Visit Robert Whitley’s 6mmAR.com website for more information on Grendel-based cartridges, and his 6mmHOT.com site for info on the 6mmBR Improved Dasher, 6-6.5×47, and 6.5×47.
May 16th, 2009
One of the most commonly-asked questions on our Shooters Forum is “what diameter bushing should I use with my neck-sizing die?” While we recommend that users obtain at least two bushings, you still have to know where to start. For hunting ammo and gas guns, we still recommend choosing a bushing that is 2 or 3 thousandths smaller than the neck diameter of a loaded round. However, in a bolt-action benchrest gun, you may well get superior accuracy with less neck tension. Larry Isenhour recently set a spectacular 50-5X 600-yard IBS record using very light tension — Larry employed a .268″ bushing for a .2695″ loaded round. At the NRA Annual meeting we discussed neck bushings during our visit to the Redding Reloading booth. It turns out that Redding has changed its recommendations for benchrest neck sizing, and now recommends that you chose a bushing that yields less tension. In the video below Patrick Ryan of Redding explains how to measure your cartridge brass and select the proper bushing diameter. Patrick also reviews some new Redding products for 2009.
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