.378 Wby

[Hi5]

The 378 Sounds like a wild calibre!!!

I have a 375H&H Ackley, im Pushing 260gr Nosler Partitions at almost 3100fps down a 26" tube. That hits hard enough for me.

I have an old reloading manual so I phoned Nosler for updated information on their 260 Accubond in the 378 Weatherby. The fastest load they provided me was the IMR load and it apparently chronographed at 3050 fps. In the old manual I have the 260 Nosler Partition (no longer available) chronographed at less than 3000 fps.

Nosler reloading data tends to be cautious, I'll agree.

It's also possible that you may have a very special combination of rifling pitch, bore diameter, smoothness of bore, etc. which allows you to have extraordinary performance from your rifle.

However, the performance level you describe is also consistent with sky high pressure that just simply hasn't manifested itself with blown primers or other signs of excess pressure. Excess pressure doesn't ALWAYS manifest itself by blown primers, stiff bolt lift, etc.

Unless you get your loads tested in a laboratory you have no CERTAIN way of knowing which alternative applies. (I guess another alternative could be that your chronograph gives excessively high readings.)

I don't intend this as an attack, nor do I want it to sound condescending. I just wouldn't want a fellow reloader to get hurt.

 

[Gatehouse]

Nosler Ammo:

375 Weatherby 260gr AccuBond®
Velocity: 3000 fps
375 WBY 260gr Spitzer(20 count)

 

[444shooter]

Another way is to shoot through chronograph and compare highest to lowest velocity and see what extreme spread is like. This would help to show eratic performance.

 

[MTM]

The Ackley is bigger than the WBY but no freebore. If primers are tight after 4-5 fireings you're good to go.

 

[mikeelliot]

I have an old reloading manual so I phoned Nosler for updated information on their 260 Accubond in the 378 Weatherby. The fastest load they provided me was the IMR load and it apparently chronographed at 3050 fps. In the old manual I have the 260 Nosler Partition (no longer available) chronographed at less than 3000 fps.

Nosler reloading data tends to be cautious, I'll agree.

It's also possible that you may have a very special combination of rifling pitch, bore diameter, smoothness of bore, etc. which allows you to have extraordinary performance from your rifle.

However, the performance level you describe is also consistent with sky high pressure that just simply hasn't manifested itself with blown primers or other signs of excess pressure. Excess pressure doesn't ALWAYS manifest itself by blown primers, stiff bolt lift, etc.

Unless you get your loads tested in a laboratory you have no CERTAIN way of knowing which alternative applies. (I guess another alternative could be that your chronograph gives excessively high readings.)

I don't intend this as an attack, nor do I want it to sound condescending. I just wouldn't want a fellow reloader to get hurt.

Again, thanks for the concern.

Ive shot at least 40-50 rds of this particular load through the gun, the prev owner developed the load, shot it through a chrono to prove to a couple doubters at the range, I think hes been handloading for 40+ years, this load has taken at least 1 black bear I know of.

It doesnt shoot the Ballistic tips nearly as well....like a 5inch group.

This will be my Moose gun, when I get around to going on a Moose hunt.

 

[Doug]

I think it is absolutely LOVELY that this thread has progressed this far, on this forum, with mature discussion, some disagreement, frank concerns being expressed, no umbrage taken, and all in all a FRIENDLY discussion.

Oh, that all of our threads amongst gun owners could be so polite and civilized!

Doug

 

[Gatehouse]

I think it is absolutely LOVELY that this thread has progressed this far, on this forum, with mature discussion, some disagreement, frank concerns being expressed, no umbrage taken, and all in all a FRIENDLY discussion.

Oh, that all of our threads amongst gun owners could be so polite and civilized!

Doug

Kiss my Azz, Doug!

 

[444shooter]

95gr RL 22.

Its a great Round.

Shoots most normal 375 H&H ammo just as accurate.

Just checked with Quickload, and that is a 10% compressed load. Works out to 57328psi. Do you use a long drop tube and crimp the bullet in?

 

[mikeelliot]

Just checked with Quickload, and that is a 10% compressed load. Works out to 57328psi. Do you use a long drop tube and crimp the bullet in?

No drop tube, Just powder funnel.