The Groove Bullets are not the same design as the bullets you speak of from Africa. Groove Bullets have "Grooves" and the bullets from Africa you spoke of have "Bumps" - two totally different concepts.
We are working on a LR (long range) version of the Groove Bullets and will introduce them in the future.
Call them what ever you want...the general net effect is still the same. And the African bullets are VERY GOOD, I might add...shooting very well in my guns. Whats nice about the bullets from GS custom is they do provide ballistic information for their bullets. It would help if ballistic data were available for the "groove" bullets....maby it is by now?
I can't get them as close to the lands as I would like i.e. feeding from the magazine in Ultra mags, but they still shoot well enough.
I had looked at what I thought were your bullets awhile ago, but I didn't see the B.C. data.........thanks....I will take another look. I would much rather buy U.S. made.
Also....what are the tolerances (manufacturing) that you hold for concentricity of the bullet body, and then the groove to body. I was wondering...plus or minus....what.
Thanks for explaining your question....yup..the G.S. bullets body rides the land and seals with the.....ridges?...hahaha semantics
Again thanks.....I pretty much thought runout would be the condition of the machine, tooling condition and setup but I wondered (all things being equal) what they were actually coming off the machine.
I have a lot of respect for what you are doing, as it's tough getting started and tougher to deal with the big boys once they decide they want your piece of the pie. You can never sit still for long in the bullet business
I had my own bullet company once and in the late 70's was going to do a match line of bullets with Randy and Connie down at Barnes. I didn't though (I couldn't stand Utah....)and that was home to them, as Idaho is home to me.
Anyway....good luck with your company and I will try your bullets in the future.
The reason I asked about how close you can get to the lands is because of the differences in the 2 designs. I knew you couldn't get close to the lands because the bore diameter is turned on the GS bullets and then the "bumps" go to the full diameter of the caliber. The first "bump" is so far back that the chamber would have to be really short to get the first "bump" close to the lands and still have enough "bumps" inside the neck to hold the bullet.
Groove Bullets are turned to the full diameter of the caliber and the "grooves" are turned into that diameter. By doing this one can get close to the lands and still have plenty of "grip" by the neck to hold the bullet.
This is what I meant by 2 totally different design concepts.
Sorry for not explaining these differences in more detail before.
PP, are you loading the 173 grain HV bullets in a 300 RUM? If so I would be very interested in comparing notes. I have done some load development in my RUM, and I have been shooting the 130's in my 7 STW for a couple of years now with great results.
I have been using the 150 HV in the 30 Ultra...how is the 173 doing....I was worried that it would not stabilize but it sounds like it is doing fine in your gun.
I have a 7 Ultra that I want to develop mono bullet loads for but I thinking I will probably try some of the Groove bullets.......but I do like the BC's of the GS bullets and they have shot very well in my guns.