From: Rabbi Moshe Sofer
To: Rabbi Avraham
A bull shot with heated pellets survived a full twelve months. The Chasam Sofer rules the animal is fully permitted, reasoning that twelve-month survival eliminates the concern of scalded intestines, examination eliminates perforation concerns, and since heating only prevents pain-based treifos (not organ-based ones), no scenario exists where heated projectiles could produce a treifah that nonetheless survives twelve months. The Rashba further confirms that a definite treifah cannot survive twelve months.
Source: Shu"t Chasam Sofer YD §52