Answers to common questions.
6.5 GAP 4s has a .534" rim diameter. (in regards to bolt face required)
Chamber has a .296" Neck.
Dies and brass provided with barrel will work fine without neck turning.
1.062" x 16 tpi shank. Will thread into Rem 700 Long and Short, Model 7, Model 600 and 660. How it will headspace and what might be required for shoulder facing, lug thickness, etc.... I have no idea.
I don't know if it will fit a Stiller.
Per George Gardner, the chamber with .081" free bore is for JLK and Berger hybrids only.
Here is his PSA from Facebook:
****Important Post****
6.5 GAP 4S and 6.5 SAUM are the same thing!
6.5 PRC is Different! and not interchangeable .
6.5 SAUM/GAP 4S has a slight velocity advantage and works well in Mag Fed rifles . Holds 64-65 grains powder
6.5 PRC is a factory offering from Hornady that has similar ballistics and can be either Mag fed or fed from an internal box I.E. a top loader. Because of this it's a better cartridge for factory rifles. Holds 60-61 grains powder.
I've made a few changes to what I have been historically been recommending. These are from new bullet designs causing issues with what was available a couple years ago.
GAP will be using the .296nk/ .120 free bore reamer from now on and will be adding a .145 FB reamer as well to our reamer selection. The .120 will work well on most match and hunting bullets . The .145 FB will be strictly for the new 143-155 class Bullets coming out with long bearing surfaces. And will be used by request only.
The old. 081 FB reamer will be by request only and only recommended if all you plan on ever shooting is 130-140 JLK and Berger Hybrids.
I believe this may help with guys getting pressure problems with the longer Bearing surface bullets in the .081 Freebore chamber. Especially initially prior to rifle breaking in.
Further information from lots of talks on here. There are about 10-12 different reamers that various smiths are using. There are all kinds of differences in body size, freebore length, freebore size (dia) and neck size. This all affects things. I cannot speak to advantages/disadvantages but I can say that some of these chambers will not yield the same results as Myself and others that did all the initial testing. Also bore size and bore dimensions will also change these results
.256x.264 is SAMMI bore/groove. A lot of barrel makers make .255x.264 and other variations. These will increase pressure. The land to groove ratio will also increase pressure . Barrels should have more groove than land. But some barrel manufactures use up to a 50/50 ratio which also increases pressure.
What's this all mean?? It means that you should always work up a load for your individual rifle and not just drop someone else's recommended charges
61 gr H1000 on a 140gr
63 gr H1000 on a 130gr
Is a max charge rule of thumb. It's not an absolute. Start at 59 on a 140 and 61 gr on a 130.
Also 1-8 is going to be our standard twist. As the trend is that the bullets will get longer. This won't be adverse at all so an easy change from 1-8.7.
Hope this helps some. Any questions ask.
And lastly. I am not really ready to budge on the price for the package. I might consider splitting it up, but the barrel would have to go first before I would sell the other components separately.
Let me know if you are interested or have any other questions.
I might consider a trade for a good quality compact spotting scope or a tactical shotgun.
