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June 27th, 2007

New 6-6.5×47 AI Varminter and Custom Spotter Mount

Forum member Sunbuilder unveiled his new 6-6.5×47 Lapua Improved Varmint rifle today in our Forum. The stock is a beautiful hardwood laminate from Richard Franklin. It’s a rig to envy, with a Stiller Diamondback action, Lilja 30″ 8-twist barrel, and a NightForce 8x32x56 NXS on top. First class components all the way round. Sunbuilder (Scott) has had excellent success already–his two longest groundhog hits were at 778 and 810 yards. Scott writes: “I started hunting with my new rig last week, my first full custom rifle. It was inspired by–I’m not sure if I should thank you guys or curse you.” Scott has already seen the potential of his new cartridge: “My improved version of the 6×47 Lapua has a 40° shoulder and reduced body taper. Dave Kiff of PT&G did my reamer design, and he dubbed it the ‘Long Dasher’. The increased velocity potential of this cartridge is partially due to the slightly increased case capacity. The load I am shooting now is 40.5gr N160, Berger 105gr Match BT, .010″ jam, CCI BR4, .002″ neck tension at 3115 fps. This has an ES under 15 fps, and it will group under 2″ at 500 yards if conditions hold. This ‘Long Dasher’ (6-6.5×47) seems to have a lot of potential (and that’s an understatement).”

“I am learning to appreciate how small wind changes at longer ranges can turn a 1″ group into a 4″ one with just a slight shift! I tried several powders (H4350, N160, N560, H4831sc), and primers (CCI 450, BR4, Rem 7 1/2, Fed 205Ms). I got better velocity with H4350, but my barrel likes the N160. I did find a [high-speed] node with H4350.”

A Better Mount for the Spotter and Rangefinder
Scott designed and fabricated a very slick set-up to hold his Zeiss spotting scope and Leica CRF RangeFinder. He’s built a combo bracket that holds both units rock steady, with a parallel line of sight (same axis and elevation). Smart. Very smart. Scott explains: “I built a mount to connect my rangefinder to my spotting scope. The mount can be adjusted, so the spotting scope and rangefinder are both centered on the same object. The only way I have found to get repeatable long-range readings is to make them from a stable base.” Scott, we think you’ve got a winner here with your innovative and clever design. (And we like the idea of a 6-6.5×47 with a 40° shoulder.)

sunbuilder spotter and rangefinder mount

Permalink Optics, Tech Tip No Comments »
June 27th, 2007

New NRA Rulebooks Available Online

Asa Yam, Asst. Moderator of the excellent forum, let us know that the new NRA Rulebooks are now online. Asa added: “Well, all but two, and they’re forthcoming.” Here is a link to the general Rulebook webpage. For the High Power Rules (which cover F-Class), Click HERE to download a .pdf file with the index page. Within that .pdf file are hyperlinks that take you to the individual chapters. If you wish to purchase hard copies of the Rule Books, they are available from the NRA Program Materials Center, for $2.50 per copy. The High Power Rifle Rulebook is item CH 16420.

Permalink Competition, News No Comments »