In a nutshell - I shot about 350 rounds in an AA factory upper, loaded to AA factory approved specs. Gun operated flawlessly, brass looked fine, Accuracy was good. But none of the cases will go all the way through the F/L sizing die. The base of the cases have expanded .014".
I have 3 questions:
1- What could cause this?
2- How can I correct the problem?
3- How can I resize my brass?
Data-
Gun - AA 24" Overwatch upper from AA (2008), Warped flash suppressor from AA
- lower - AA single stage tactical trigger, buffer - A1/A2, 5.9", 5.18oz (146.8g)
w/ 5 ea 18.4g weights and 1 spacer 9.4g. Spring is 12.5' free, 44 coils of .072"
round wire.
Loads - bought lots of AA brass and die set from AA w/ gun. Used reloading table from
AA website. Using new AA brass loaded up several combinations to try. Accuracy
has always been at least 1moa and generally much better. Visually, fired brass
looks fine, No primer flattening, ejector marks, rare dent on a body. So I just kept
shooting my new AA brass. About 350 rounds. Gun runs smoothly and doesn't jump around.
95g H VMax - 31.3g H BL-C(2), CCI-450, 2.200", 2750fps (from table)
108g Scenar - 32.0g H BL-C(2), CCI-450, 2.265", 2730fps (from table)
120g Barnes TSX- 30.8g H BL-C(2), CCI-450, 2.230", 2495fps (from table)
120g Barnes TSX- 30.0g W 748), CCI-450, 2.230", 2503fps (from table)
Went to reload once fired AA brass - vibrating tumbler, went to resize w/ Redding F/L die and would not go the last .25". Die made a large ring of brass at its travel stop. Used Imperial Sizing Die Wax from Redding and RCBS's Resizing Lube. Used 2 Redding F/L Sizing dies one w/ the neck bushing option/ The press is an old RCBS single stage with an RCBS #32 shell holder.
So I measured my once fired Alex-R and compared it to new AA brass:
Base to Shoulder - Fired - n= 45, mean= 1.2155", SD= .00069"
New 1.200". Base to shoulder got .0155 longer.
COL - Fired - n= 98, mean= 1.507", SD= .005"
New - 1.516. COL got .009" shorter.
Base Dia. - Fired- n= 86, mean= .453", SD= .000185"
New - .439". Base diameter grew .014".
Neck OD - Fired - n= 93, mean= .2989", SD= .0004"
New - n= 51, mean= .2877", SD= .0005", Necks got .0112" larger.
Thanx for reading my ramblings.
I have 3 questions:
1- What could cause this?
2- How can I correct the problem?
3- How can I resize my brass?
Data-
Gun - AA 24" Overwatch upper from AA (2008), Warped flash suppressor from AA
- lower - AA single stage tactical trigger, buffer - A1/A2, 5.9", 5.18oz (146.8g)
w/ 5 ea 18.4g weights and 1 spacer 9.4g. Spring is 12.5' free, 44 coils of .072"
round wire.
Loads - bought lots of AA brass and die set from AA w/ gun. Used reloading table from
AA website. Using new AA brass loaded up several combinations to try. Accuracy
has always been at least 1moa and generally much better. Visually, fired brass
looks fine, No primer flattening, ejector marks, rare dent on a body. So I just kept
shooting my new AA brass. About 350 rounds. Gun runs smoothly and doesn't jump around.
95g H VMax - 31.3g H BL-C(2), CCI-450, 2.200", 2750fps (from table)
108g Scenar - 32.0g H BL-C(2), CCI-450, 2.265", 2730fps (from table)
120g Barnes TSX- 30.8g H BL-C(2), CCI-450, 2.230", 2495fps (from table)
120g Barnes TSX- 30.0g W 748), CCI-450, 2.230", 2503fps (from table)
Went to reload once fired AA brass - vibrating tumbler, went to resize w/ Redding F/L die and would not go the last .25". Die made a large ring of brass at its travel stop. Used Imperial Sizing Die Wax from Redding and RCBS's Resizing Lube. Used 2 Redding F/L Sizing dies one w/ the neck bushing option/ The press is an old RCBS single stage with an RCBS #32 shell holder.
So I measured my once fired Alex-R and compared it to new AA brass:
Base to Shoulder - Fired - n= 45, mean= 1.2155", SD= .00069"
New 1.200". Base to shoulder got .0155 longer.
COL - Fired - n= 98, mean= 1.507", SD= .005"
New - 1.516. COL got .009" shorter.
Base Dia. - Fired- n= 86, mean= .453", SD= .000185"
New - .439". Base diameter grew .014".
Neck OD - Fired - n= 93, mean= .2989", SD= .0004"
New - n= 51, mean= .2877", SD= .0005", Necks got .0112" larger.
Thanx for reading my ramblings.
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