Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
Watch Out for Scammers!
We've now added a color code for all accounts. Orange accounts are new members, Blue are full members, and Green are Supporters. If you get a message about a sale from an orange account, make sure you pay attention before sending any money!
Planning on building a AR in either 6.5 CM or .260 Rem. I pretty much settled for a 20" barrel what kind of muzzle velocities are you guys getting with what loads?
I Have a 20 inch Tikka 260 bolt gun and I am getting 2715 FPS with 43.6 grains of H4350 under a 140 Berger. I'm using Lapua brass and BR2 primers. I think you might be hard pressed to get that in a gas gun though.
Probably expect about 120fps loss from the barrel length then factory advertised velocities. However that is just a very rough round about estimation. Every barrel is different.
I have seen about 25fps per 1" of barrel length with a 308 that I cut the barrel from 26" to 22" (lost 100fps on my 175gr/4064 loads). I also have a 260 Rem700 with a 25" Bartlein 1:8" barrel and a 260 GAP10 with a 20" Bartlein 1:8.2" barrel. 42.6gr of H4350 and a 140gr SMK runs 2820fps in my R700 while the same load but in SSA brass instead of Lapua runs 2710fps in my GAP10. The same lot of Prime ammo thru each rifle shows similar velocity loss to my 308 experience.