Yes. But I sometimes shoot 1 1/8 oz loads in my 1921 P or late Rem barrelled C.
Studies published in DGJ show a 5 to 8 percent increase in chamber pressure of an expanded length 2 3/4 “ inch cartridge over one 1/8” shorter. SAAMI tolerances for cartridge length for a nominal 2 3/4” load are 2 3/4 to 2 5/8”. If you actually measure you will find anywhere from 2 1/2 to 2 3/4” are common. Winchester AA are commonly short. Parker chambers were purposefully 1/8 short for better gas sealing. In my opinion, this small short chamber consternation is much to do about nothing of consequence.
Parker 16ga normal chamber length is 2 9/16”. Barrel snd chamber dimensions are provided in TPS, which is a necessity for any serious Parker shooter or collector. TPS also identifies the max service load for all gauges, which equates to the SAAMI max service load in use at the time. A 1 1/8 oz at 2 3/4 will be at max, these nasty to shoot 1 1/8 at 3 will be over. SAAMI maxes have increased for both service loads and proof loads and present SAAMI maxes will be over the limit for any vintage gun I am aware of .
All the pictured brands are fine. RST s are $110/ case, the others may be more costly. I think Midway had Feds for $120/case and often not available. RST is nice because they make up what you want when you want. Besides, Morris Baker is a good guy. But no, to get an acceptable 1 oz load, you neither have to use RST or reload. You do though if you want a 7/8 oz load.
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