300 win. Mag

[missourideere]

I'm shooting 73.5 grains of imr 7977 with a 208 a max book shows at 75 grains I should be shooting 2852fps. I dont have a chronograph so I just checked how much bullet drop was from 100yds-400yds it dropped 22" i put that in my calculator and it comes out to @ 3200fps. Is there something im missing? My barrel is 2" longer then the book used to test

 

[Len Backus]

Moved to RELOADING.

 

[Huntnpack]

Re check your data inputs, I get ya closer to 3055 FPS.

 

[FEENIX]

Save up and invest in a coronagraph (pun intended for those that know which thread I am referring to). Borrow or have a friend chrono for you, otherwise, it is just a WAG. You want as close to "actual" as possible because each rifle is different. I have three .300 WMs with the same barrel length and I can fire same load with varying velocities. "IF" you're happy with a WAG, then press on.

Good luck!

 

[missourideere]

Save up and invest in a coronagraph (pun intended for those that know which thread I am referring to). Borrow or have a friend chrono for you, otherwise, it is just a WAG. You want as close to "actual" as possible because each rifle is different. I have three .300 WMs with the same barrel length and I can fire same load with varying velocities. "IF" you're happy with a WAG, then press on.

Good luck!

Yes I believe I will just buy one thank you I hate guessing

 

[Double Dropper]

Hes right LOL I am sick of guessing on the speeds, always end up on range day here and there borrowing a friends, time to get my own.