F-TR load with Heavier projectiles

[gsg5pk]

I currently use 185 LRBT and 185 Hybrid with my competition in F-TR.



My barrel twist was 1:10" finish at 24"

I wanna give a try with heavier projectile like 215 Hybrid.

So, any suggestion for my idea?


What is the minimum freebore for 215 Hybrid?

 

[broncman]

Not sure of my freebore but it is over .200". I sent three dummy rds when it was chambered. As far as the 24" barrel....not sure you would get enough velocity to make the heavies an advantage....

Ken

 

[gsg5pk]

Wow. Seem like those will not proper with my chamber which has only .098" fb

 

[XTR]

Take a look at the responses to your post on Snipers hide asking the same question.

As to throat. I experimented with 215s in an old barrel chambered with a .168 freebore, I pushed it out well over .200 to get it to seat the 215s with the bearing surface above the neck shoulder junction.

Your chamber is way too short.

 

[savageshooter86]

if you run ballistics you will see shooting the heavies in that short of a barrel really isn't going to give you anything vs a lighter bullet. Which would have less recoil

I just ran it for my 22" barrel and was surprised at how little anything above 178 would gain. Hardly any wind advantage at 600, and just barely less drop

 

[Steve Blair]

if you run ballistics you will see shooting the heavies in that short of a barrel really isn't going to give you anything vs a lighter bullet. Which would have less recoil

I just ran it for my 22" barrel and was surprised at how little anything above 178 would gain. Hardly any wind advantage at 600, and just barely less drop

[br]
A Hornady 178 A-Max would need 3350 to equal the 1000 yard wind deflection of a 215 Hybrid at 2460, doable from a 24" barrel. The OP's freebore will not allow reasonable seating of a 215, however. Loaded to equal pressure in the same cartridge, the higher B.C. projectile will always have less wind drift.

 

[savageshooter86]

Steve I ran same with 215 hybrid and assumed my 22" could push them 2400 fps and compared it to my 178 BTHP load and knowing my velocity now(2650), and also knowing this is the high node before I hit pressure. 215 Hybrid gives 1 MOA less wind drift but also drops 1.9 MOA more than the Hornady. So to me, it appears not much to be gained in my set up. Assuming the calculations really help look at this info

 

[Steve Blair]

Using your velocities, which could as easily be correct as those I used, it appears 178 A-Max show 5.0 MOA 500 yard wind deflection and 3.82 MOA for the 215. I did not look at drop because I'm a KD shooter. Given that 22" and 24" barreled .308 rifles are often used in unknown distance tactical matches, it's a valid point.

 

[savageshooter86]

Steve run with 178 BTHP not the AMAX. Just curious. I am using the Shooter App with temp and all that to do my comparisons. Still your 1.2 difference in drift is close to my calculated 1 MOA. I had no choice but the 22". I would like a 32" barrel. I know the MOA less wind drift is helpful and others would probably like to switch to that but like I said I think they are more $$ and more recoil and throat would have to be longer. So for me the $$ to what it gives me isn't worth it

 

[Steve Blair]

I agree. After wrestling most of the year with 230 Hybrids in .300 WSM, I have finally achieved a sort of understanding with them. The agreement is: I don't lose concentration or focus for a second and they don't bite me.

 

[Beau]

What brought Hornady's into this? He's shooting 185 Bergers.

 

[savageshooter86]

was referencing my short barrel to show that it might not be worth it to shoot the 215s. Also the 178 BTHP can be a substitute practice bullet for the 185 LRBT from everything I have read and from a friend's experience. Uses same charge and everything and shoots similar

 

[Beau]

Fair enough!

 

[broncman]

I will second the 178 Hornadys. They shoot to darn near same point of aim as my juggernauts did. Juggernauts were easier to tune and have the wind advantage but the 178 was not shabby!

 

[r bose]

For what it's worth. I shoot a 10 twist Hart 26" 308 bolt gun and with 175 sierra's at 2740 FPS gives me a drift of 27.5" at 600 YDS and 88" at 1000 YDS in a full value wind.

Started experimenting with the 208 A-Max's and 210 Bergers and R-17. From both I can get 2625 FPS. That calculates to a full value wind drift of 21" at 600 YDS and 65"at 1000 YDS. I've shot all these loads at these distances to confirm drop and drift values.

Do they make me shoot better......no. But when I miss a change in the wind they punish me less.