Book powder charge difference

[Rflshootr]

It might just be a mistake as well. I've caught a couple of them on their infinity cd. 3600 is bs with a 55. I can almost get that out of my 6br with an 8 twist 25" barrel.
What edition manual do you have? I wasn't aware of anything recently new.

 

[C-130 Dude]

I have a 220 Swift with 1-14 twist rate. In the newer Sierra Reloading manual. It shows the 55gr bullet down to 3600fps. In the older manual it's it shows 3900fps velocity with a higher powder load. I have had this rifle from the early 70's. In the newer addition Sierra manual it notes the change in twist rate from 1-14 to 1-12 twist rate. Not for sure, but I would say there was a reason for the reduced powder load, and with reduced velocity. So I would venture to say that there a pressure increases from the differences with the twist increase.

The current Sierra manual is #6. Is this the one your speaking of?

 

[Rflshootr]

The current Sierra manual is #6. Is this the one your speaking of?

Yes. I have Infinity 6 CD.

220 Swift​
Primer:​	WLR​	Test Firearm: ​	Savage 12VSS​
Case: ​	Winchester​	BBL Length: ​	26"​
Twist: ​	1x14"​	Trim-to Length: ​	2.195"​
Bullets: ​
#1350 .22 Caliber (.224) High Velocity 55 gr. SMP OAL 2.660 #1355 .22 Caliber (.224) High Velocity 55 gr. FMJBT OAL 2.680 #1360 .22 Caliber (.224) High Velocity 55 gr. SPT OAL 2.680 #1365 .22 Caliber (.224) High Velocity 55 gr. SBT OAL 2.680 #1390 .22 Caliber (.224) High Velocity 55 gr. HPBT OAL 2.650 #1455 .22 Caliber (.224) High Velocity 55 gr. BlitzKing OAL 2.680

Powder/Velocity	3400	3500	3600	3700	3800	3900
IMR-3031	32.8	33.8	34.8	35.8	36.8
IMR-4895	34.0	35.0	36.0	37.0
VARGET	34.2	35.4	36.6	37.8
IMR-4064	34.0	35.0	36.0	37.0	38.0
IMR-4320	36.0	37.0	38.0
Viht N140	32.6	34.5
BigGame	35.9	37.4	38.9
RE-15	34.0	35.3	36.6	37.9
H380	37.2	38.6	40.1	41.5
H414	38.2	39.3	40.3	41.4	42.4	43.5
Viht N150	33.6	35.0	36.4
XMR-4350	39.6	40.4	41.2	42.0
IMR-4350	39.1	40.2	41.3	42.4
Energy/ft.lbs.	1412	1496	1582	1672	1763	1857

Accuracy Load: RE-15/ 36.6grs. 3600fps/ 1582ft. lbs.

Hunting Load: IMR-4064/ 37.0grs. 3700fps/ 1672ft. lbs.

 

[C-130 Dude]

Yes. I have Infinity 6 CD.

220 Swift​
Primer:​	WLR​	Test Firearm: ​	Savage 12VSS​
Case: ​	Winchester​	BBL Length: ​	26"​
Twist: ​	1x14"​	Trim-to Length: ​	2.195"​
Bullets: ​
#1350 .22 Caliber (.224) High Velocity 55 gr. SMP OAL 2.660 #1355 .22 Caliber (.224) High Velocity 55 gr. FMJBT OAL 2.680 #1360 .22 Caliber (.224) High Velocity 55 gr. SPT OAL 2.680 #1365 .22 Caliber (.224) High Velocity 55 gr. SBT OAL 2.680 #1390 .22 Caliber (.224) High Velocity 55 gr. HPBT OAL 2.650 #1455 .22 Caliber (.224) High Velocity 55 gr. BlitzKing OAL 2.680

Powder/Velocity	3400	3500	3600	3700	3800	3900
IMR-3031	32.8	33.8	34.8	35.8	36.8
IMR-4895	34.0	35.0	36.0	37.0
VARGET	34.2	35.4	36.6	37.8
IMR-4064	34.0	35.0	36.0	37.0	38.0
IMR-4320	36.0	37.0	38.0
Viht N140	32.6	34.5
BigGame	35.9	37.4	38.9
RE-15	34.0	35.3	36.6	37.9
H380	37.2	38.6	40.1	41.5
H414	38.2	39.3	40.3	41.4	42.4	43.5
Viht N150	33.6	35.0	36.4
XMR-4350	39.6	40.4	41.2	42.0
IMR-4350	39.1	40.2	41.3	42.4
Energy/ft.lbs.	1412	1496	1582	1672	1763	1857

Accuracy Load: RE-15/ 36.6grs. 3600fps/ 1582ft. lbs.

Hunting Load: IMR-4064/ 37.0grs. 3700fps/ 1672ft. lbs.

Good. I find it strange about the differences. I wish the publisher would shed light on the disparities.

 

[Rflshootr]

Good. I find it strange about the differences. I wish the publisher would shed light on the disparities.

Call Sierra and ask.

 

[C-130 Dude]

Call Sierra and ask.

I have. Not providing much help here.

 

[dk17hmr]

Hornady podcast #082 talks about the difference in load data from one source to another.

 

[C-130 Dude]

Hornady podcast #082 talks about the difference in load data from one source to another.

Yup. But I've never actually seen any company provide an explanation why they change the load from year to year.

 

[Rflshootr]

I have. Not providing much help here.

If you want to have a little fun...call them back and ask if they shot this data from a pressure gun....then listen to them stammer and stutter.

 

[C-130 Dude]

If you want to have a little fun...call them back and ask if they shot this data from a pressure gun....then listen to them stammer and stutter.

I asked that question first.

 

[Rflshootr]

And their answer was?

 

[C-130 Dude]

And their answer was?

Ooh, ahh................You'd think one of the largest sports companies could afford a pressure gun setup..

 

[Bob Wright]

I've noticed erroneous information in Sierra V6, called them to confirm. Their answer was essentially, thanks, we know they're there. We're not perfect, have a good day.
So that started me into verifying multiple sources of load data as I should have been doing anyway.

 

[Rflshootr]

I've noticed erroneous information in Sierra V6, called them to confirm. Their answer was essentially, thanks, we know they're there. We're not perfect, have a good day.
So that started me into verifying multiple sources of load data as I should have been doing anyway.

Yeah. you'd think they'd get off their duffs, fix the mistakes, send out an update.....and maybe make some bullets to get on the shelves.