Range Report Range Report - looking for advice/feedback

[Sniper260]

260 Tac chamber - 140gr berger VLD Target - 42.0gr H4350 - Lapua brass - Federal Match Primer

28 inch 1:8 twist Brux barrel

95 degrees F ambient air temp in shade at Point of Fire
28% Humidity
961 ft Altitude

Shot 1 - 2926 fps
Shot 2 - 2985 fps
Shot 3 - 2973 fps
Shot 4 - 2979 fps
Shot 5 - 2977 fps

I gave a good amount of time in between shots and checked the ammo temp and chamber temp with a laser thermometer between shots to only shoot the next shot once everything cooled back down to the same stable temp for "more better" results.

What do yall think? First shot was "cold bore" I let the ammo and rifle sit in the shade there for 30 min or so to adjust to the ambient air temp as well. I wasnt expecting higher 2900's though! I was expecting 2800's but this looks like good news, I am happy if it shoots this speed.

Most people have a 26 inch barrel - Do yall think these 2 extra inches in barrel make that extra 100 fps faster? is that what I am seeing here?

This was the "pet load" that I worked up... it's shooting really really well. It's not a max load, but any faster groups started opening up, then I went to max load around 44gr and started getting a sticky bolt... so this is right about where I stand with this rifle as of now..

 

[Deleted member 10043]

I hate see a request unanswered for so long. Yes, you will see extra fps for a barrel that length. That is only normal.

Are you checking the brass before you get to a sticky bolt situation. Try not to run the pressure up based on that alone.

 

[AZ2000]

260 Tac chamber - 140gr berger VLD Target - 42.0gr H4350 - Lapua brass - Federal Match Primer

28 inch 1:8 twist Brux barrel

95 degrees F ambient air temp in shade at Point of Fire
28% Humidity
961 ft Altitude

Shot 1 - 2926 fps
Shot 2 - 2985 fps
Shot 3 - 2973 fps
Shot 4 - 2979 fps
Shot 5 - 2977 fps

I gave a good amount of time in between shots and checked the ammo temp and chamber temp with a laser thermometer between shots to only shoot the next shot once everything cooled back down to the same stable temp for "more better" results.

What do yall think? First shot was "cold bore" I let the ammo and rifle sit in the shade there for 30 min or so to adjust to the ambient air temp as well. I wasnt expecting higher 2900's though! I was expecting 2800's but this looks like good news, I am happy if it shoots this speed.

Most people have a 26 inch barrel - Do yall think these 2 extra inches in barrel make that extra 100 fps faster? is that what I am seeing here?[/COLOR]
This was the "pet load" that I worked up... it's shooting really really well. It's not a max load, but any faster groups started opening up, then I went to max load around 44gr and started getting a sticky bolt... so this is right about where I stand with this rifle as of now..

Rough calcs from checking chrono speeds on different barrel lengths will vary, muzzle velocity roughly, depending on bullet and powder types 35 to 45 fps per extra inch of barrel and a big factor is where you set up your chronograph, distance from muzzle and height above sensors. Every time I have shot a chrono, literally, I always read the set requirements so I get as close as possible to the recommended height and distance, but damn missed that part about scope height versus bullet trajectory? My buddy's asked me if I had a hunting license for those things, I think they were trying to be funny.
But to answer your question, yes.

AZ2000