BENHAM, Chief Justice.

This appeal is from Ronald Ray Christopher's conviction for the murder of his stepson, Timothy Ledbetter. Christopher, married to Ledbetter's mother, had an altercation with Ledbetter. When Ledbetter left the family's home after the altercation, Christopher armed himself with a pistol, said (according to the victim's mother) that he was going to kill Ledbetter, and opened the door to look for him. Finding Ledbetter outside the door, Christopher fired twice, the second shot fatally wounding Ledbetter in the head. At the scene, Christopher claimed self-defense and, after receiving warnings pursuant to Miranda v. Arizona, 384 U.S. 436 ( 86 S.Ct. 1602, 16 L.Ed.2d 694) (1966), commented to police officers that the military had trained him to shoot to kill. The murder weapon was found hidden under a mattress.

1. Christopher contends on appeal that the trial court erred in denying his motion for new trial because the verdict was against the weight of the evidence. On appeal, this Court considers not the weight of the evidence, but its sufficiency. Burgeson v. State, 267 Ga. 102 (10) ( 475 S.E.2d 580) (1996). The evidence at trial, summarized above, was sufficient to authorize a rational trier of fact to find Christopher guilty of murder beyond a reasonable doubt. Jackson v. Virginia, 443 U.S. 307 ( 99 S.Ct. 2781, 61 L.Ed.2d 560) (1979); Cole v. State, 254 Ga. 286, 287 ( 329 S.E.2d 146) (1985).

2. After police officers took Christopher into custody, they placed him in the back of an ambulance for the purpose of testing his hands for gunshot residue. During the testing, prior to which a police officer had given Christopher Miranda warnings, Christopher asked whether Ledbetter was dead and, upon hearing that he was, stated that he had been well taught in Vietnam. When asked what he meant, Christopher said he had been taught to shoot to kill. He objected at trial to testimony regarding his statement, contending that it was the result of illegal custodial interrogation. The trial court found that the statement was volunteered and was not the result of custodial interrogation, and found further that the statement would have been admissible had it been the product of interrogation because Christopher had been advised of his right to remain silent.

"In the absence of evidence that the trial court's factual and credibility determinations were clearly erroneous, we uphold those determinations on appeal. [Cit.]" Turner v. State, 267 Ga. 149 (6) ( 476 S.E.2d 252) (1996). Our review of the record persuades us that the trial court's determination that Christopher's statement was voluntary is not clearly erroneous. The police officers involved testified that although there was an odor of alcohol in the ambulance while Christopher was being tested for gunshot residue, he did not appear to be intoxicated and spoke coherently. See Miller v. State, 263 Ga. 723 (3) ( 438 S.E.2d 81) (1994). The remark about being taught well was made without any prompting by the police officers and was plainly a voluntary statement. Hallman v. State, 263 Ga. 72 (1) ( 428 S.E.2d 344) (1993). Christopher's elaboration on his first remark, even if considered the result of interrogation because an officer asked what the first statement meant, must also be considered voluntary in light of the fact that the officer had explained to Christopher his Miranda rights just moments before the conversation occurred, in the same place. Turner v. State, supra.

3. Finally, Christopher contends that the trial court's refusal to give Christopher's requested charge on justification was error because the charge given did not specifically address a shooting. The charge given did, however, fully explain the concept of justification. "It is not necessary to give the exact language of a request to charge when the applicable principles are fairly covered by the charge as given. [Cit.] We conclude that the charge when taken as a whole was adequate, and we consequently find this enumeration to be without merit." Carver v. State, 262 Ga. 723 (2) ( 425 S.E.2d 657) (1993).

Judgment affirmed. All the Justices concur.

BENHAM, Chief Justice.

DECIDED APRIL 13, 1998.