imr 4451 data question

[MildBill]

Has anyone taken a look at the imr 4451 data for the 243 Win in the 2015 hodgdon annual manual magazine.

It appears to be based on the data as shown in there looking at the weights for all the different bullets and comparing it with the other similar powders that maybe they have the data for 4451 switched around for the 85 gr Barnes tripple shock and the 90 grain speer sp?

Anyone have any thoughts on that?

THanks

 

[243winxb]

Anyone have any thoughts on that?

Different components = Different Pressures.


Different components = Different Pressures.

Old post warning......

IMR 4451 IN 243 Winchester. Sierra 85gr hpbt #1530.

Rifle- Remington 600 Mohawk. 18" bbl.

Rem brass, Redding fl bushing die, no expander. .270" bushing.

CCI Br2 primer . Flash hole uniformed. Temperature 40 degrees. No wind.

100 yards IMR 4451 -44.0 GR 5 shots = .905" The first shot from clean barrel opened group. Just measuring the 4 =.482"

IMR 4451 - 44.5grs = 5 shots -.733"

Col 2.640" Sizing only 1/2 of the necks with the bushing.

Fired 1 round of each at 45.0 & 45.5grs to look for pressure. Seen no pressure signs.

I don't see any less copper fouling with this powder? Very old factory barrel. Many rounds fired.

I worked up from 37.5grs. because of Hodgdons 90gr bullet data for safety. It was a long road , working up.
I suggest working up using the Hodgdons/Sierra 80 gr data. Do so at your own risk. Be safe.