Winchester 243 load data

That Nosler bullet is very long and the extra overall length of the cartridge maximizes powder space in the case for rifles designed for those long bullets. Your XPR is likely designed for more typical .243 bullets of 100 grains or less. In addition those long bullets require a fast twist barrel for stabilization (accuracy), something your XPR probably lacks.

drg560 said:

OAL to be 2.710

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Its the SAAMI maximum COL that will fit the magazine. A shorter COL is ok. View attachment 969679

drg560 said:

I'm reloading winchester 243's, my Nossler book calls for OAL to be 2.710, they won't chamber, to long, factory ammo is 2.681. Why is the manual saying this. I can't find any data showing the shorter number. I'm shooting a Winchester XPR 243 bolt action.

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Something isn't right here. A few more details would help us understand.

Agreed, I bet it’s not the length

drg560 said:

I'm reloading winchester 243's, my Nossler book calls for OAL to be 2.710, they won't chamber, to long, factory ammo is 2.681. Why is the manual saying this. I can't find any data showing the shorter number. I'm shooting a Winchester XPR 243 bolt action.

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Look up hodgdon, my long throated rifles run .268 with the sierra and nosler hunting bullets, but my short throated ones run .2.62-2.65 depending on the bullet. If it truly won't chamber, you need to adjust your sizing die.

Are you sure your shoulder was bumped down enough when you sized them?
I've had that stop cartridges from chambering.

You can certainly seat a little deeper and try that.

If the OP would offer some details this would be easier then speculation.
What bullets ?
What brass ?
Does the resized brass chamber freely prior to seating a bullet?
Is there resistance on bolt closer or bolt lift?
Are the primers fully seated?

These are just a few questions for the op

Hodgdon lists col longer then 2.710" for 105 to 115 gr bullets.

They also have a 1-10 Twist rate.

For whatever reason, my 1:9" twist Ruger American in 243 won't stabilize the 105 gr. Match bullets.

South Prairie Jim said:

Something isn't right here. A few more details would help us understand.

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I agree. What exactly is the bullet? I usually run out of bullet before I hit the riflings.

My first 243 win a savage m111 was tired when I bought it, had considerable throat erosion. I was loading 100 gr hornandy interlock, Speer 100gr gamekings, and prohunters primarily. The pad listed by hogden was 2.65" had to load 2.700"go get itchy shoot well. Oal is dependent on several factors, freebore, bullet shape, weight, length, material, cup and core or solid copper. I am currently shooting an m11 savage in 243 thaty oal is set at 2.67" with the previously mentioned 100 gr bullets.

BBarn said:

For whatever reason, my 1:9" twist Ruger American in 243 won't stabilize the 105 gr. Match bullets.

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It's cuz of the length of bullet, based on the stability calculations I've run previously for our 9 twisters the 103 eld and 90 tgk and 95 classic bergers are the slipperiest I'd try in that barrel.

drg560 said:

I'm reloading winchester 243's, my Nossler book calls for OAL to be 2.710, they won't chamber, to long, factory ammo is 2.681. Why is the manual saying this. I can't find any data showing the shorter number. I'm shooting a Winchester XPR 243 bolt action.

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Nosler data manual 8 or 9 has data for 243 using all bullets with 1/10 twist @ 2.610"/ 2.680" tested and they list max @ 2.710".
https://load-data.nosler.com/load-data/243-winchester/

The data for 105/107gr is for fast twist and they list 1/8 twist tested and max tested @ 2.710"