Greetings all,
I have recently shot a Remington VLSS in .221 Fireball. All five rounds I fired split, not merely cracked, at the neck, all the way from the mouth of the case to the top of the shoulder.
I looked at the SAAMI specifications, which list the diameter of the neck of the chamber as 0.2550 and (max?) diameter of the neck as 0.2530.
The loaded round I was shooting, stamped R-P 221 Rem Fireball, measures at the neck on average 0.2470. The fired cases' necks were distorted out-of-round and measure at the largest dimension on average 0.2550.
I have also measured new cases (1) R-P 221 Rem Fireball with an average neck diameter of 0.2460 and (2) Lapua cases with an average neck diameter was 0.2470.
Could the difference of 0.008 (0.2550 - 0.2470) be the culprit?
Kindest regards,
M
I have recently shot a Remington VLSS in .221 Fireball. All five rounds I fired split, not merely cracked, at the neck, all the way from the mouth of the case to the top of the shoulder.
I looked at the SAAMI specifications, which list the diameter of the neck of the chamber as 0.2550 and (max?) diameter of the neck as 0.2530.
The loaded round I was shooting, stamped R-P 221 Rem Fireball, measures at the neck on average 0.2470. The fired cases' necks were distorted out-of-round and measure at the largest dimension on average 0.2550.
I have also measured new cases (1) R-P 221 Rem Fireball with an average neck diameter of 0.2460 and (2) Lapua cases with an average neck diameter was 0.2470.
Could the difference of 0.008 (0.2550 - 0.2470) be the culprit?
Kindest regards,
M